[alsa-devel] "alsactl store" fails to save Echo Gina3G mixer

[S. Christian Collins]

I have attached the output of the alsa-ctl-dimen-check program.

-~Chris


On 08/30/2017 10:50 PM, Takashi Sakamoto wrote:
> 
> $ alsactl -f ~/asound1.state store 1
> (alsa-utils:alsactl/alsactl.c)
> main()
>    (alsa-utils:alsactl/state.c)
> ->save_state()
>    ->get_controls()
>      ->get_control()
>        snd_ctl_elem_info(info)
>        count = snd_ctl_elem_info_get_count(info)
>        for (i = 0; i < count; i++)
>          snd_ctl_elem_value_get_integer(ctl, i)
> 
> I guess that 'snd-echo3g.ko' returns value greater than 128 in a call 
> graph of 'snd_ctl_elem_info_get_count()', then a call of 
> 'snd_ctl_elem_value_get_integer()' hits an assertion in the function.
> 
> A patch mentioned by Mark Hills (a commit 275353bb684e 'ALSA: echoaudio: 
> purge contradictions between dimension matrix members and total number 
> of members') is fairly valid in a logical design of ALSA control 
> protocol/interface. In detail, please refer to my post[1].
> 
> Some of ALSA drivers for PCI cards produced by Echo Audio potentially 
> have problems which I mentioned in the post. They can cause 
> buffer-over-run over 'struct snd_ctl_elem_value.value' in user space. 
> The drivers should be going to fix.
> 
> I wrote a small program to validate dimension information for your 
> card[2]. Would you please execute it? Like:
> 
> $ gcc -o ./test ./alsa-ctl-dimen-check.c
> $ ./test /dev/snd/controlC[0-9]
> 
> An argument is required for a path of special file for ALSA control 
> character device for your sound card.
> 
> [1] [alsa-devel] [PATCH 0/3] ALSA: add dimension information validator
> http://mailman.alsa-project.org/pipermail/alsa-devel/2016-June/109811.html
> [2] alsa-ctl-dimen-check.c
> https://gist.github.com/takaswie/cd670ee88b7fd25c68780610ad8ad54f
> 
> 
> Regards
> 
> Takashi Sakamoto
-------------- next part --------------
numid: 1
  iface: mixer
  device: 0
  subdevice: 0
  name: PCM Playback Volume
  index: 0
  count: 14
numid: 2
  iface: mixer
  device: 0
  subdevice: 0
  name: Line Playback Switch (-10dBV)
  index: 0
  count: 6
numid: 3
  iface: card
  device: 0
  subdevice: 0
  name: VU-meters Switch
  index: 0
  count: 1
numid: 4
  iface: mixer
  device: 0
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  count: 64
  dimension:
    0: 2 32
    1: 16 4
    2: 2 32
numid: 5
  iface: mixer
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  dimension:
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    1: 10 14
    2: 2 70
numid: 6
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    2: 2 70
numid: 7
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